Monthly Shift Calculator

1. Enter scheduled shifts
Provide the number of regular shifts expected during the month.

2. Enter hours per shift
Use paid hours and exclude unpaid meal periods when appropriate.

3. Add overtime or extra shifts
Enter additional shifts or hours separately so they remain visible in the breakdown.

4. Set a monthly target if needed
Use a contract, staffing plan, or budgeted-hours target for comparison.

5. Review total and average hours
Check monthly hours, average weekly hours, and any difference from the target.

Formula

Regular hours = Regular shifts × Hours per regular shiftExtra hours = Extra shifts × Hours per extra shiftTotal monthly hours = Regular hours + Extra hoursAverage weekly hours = Total monthly hours × 12 / 52Target variance = Total monthly hours - Monthly target hours

Where

• Shifts = number of scheduled work periods
• Hours per shift = paid duration of each shift
• Average weekly hours = monthly hours converted using 52 weeks per year

Assumptions

The model uses average weekly conversion and does not determine statutory overtime. Overtime eligibility may depend on weekly, daily, pay-period, or jurisdiction-specific rules.

What the result means

Monthly shift hours based on the values entered.

Results are estimates and may differ from payroll, tax, legal, investment, or accounting systems.

Given

• Regular shifts: 18

• Hours per regular shift: 8

• Extra shifts: 2

• Hours per extra shift: 6

• Monthly target: 160 hours

Calculation

Regular hours = 18 × 8 = 144 hours

Extra hours = 2 × 6 = 12 hours

Total monthly hours = 144 + 12 = 156 hours

Average weekly hours = 156 × 12 / 52 = 36.00 hours

Target variance = 156 - 160 = -4 hours

Result

• Total monthly hours: 156

• Average weekly hours: 36.00

• Variance from target: 4 hours below target

Interpretation

The schedule provides 156 paid hours, which is four hours short of the stated monthly target.